“Visiting some of the strongest people we have ever met... fighting the toughest battle of them all... for their lives,” she wrote in the caption of a photo showing the couple in a parking lot and facing the Mandalay Bay Resort and Casino, where a gunman opened fire on the concert crowd from his hotel room on Oct. 1.

“You have helped us try to begin the healing process by seeing the strength each one of you have,” she wrote. “Thank you for today. We will never forget.”

"So many people are hurting. They're our children, parents, brothers, sisters, friends — they're all part of our family,” he told the audience before his performance. “So I want to say to them: We hurt for you and we hurt with you. But you can be sure that we’re going to walk through these tough times together, every step of the way. Because when America is at its best, our bond and our spirit, it's unbreakable."